CONNOR-WINFIELD SCG6500NT

SCG6500NT
Synchronous Clock
Generator
PLL
2111 Comprehensive Drive
Aurora, Illinois 60505
Phone: 630- 851- 4722
Fax: 630- 851- 5040
www.conwin.com
Features
• Digital PLL Control
• 622.08 MHz LVPECL Output, Ultra-low Jitter
• 155.52 MHz LVPECL Output, Ultra-low Jitter
• Two 77.76 MHz LVPECL Outputs, Low Litter
• 8 kHz LVPECL Output
• Dual 8 kHz Input References
• Supports Manual and Autonomous Modes
• 3.3 VDC Power Supply
Applications
Bulletin
Page
Revision
Date
Issued By
SG034
1 of 12
(ADVANCED) A05
24 JUNE 02
MBatts
The SCG6500NT is designed for use as a reference input for
OC-192 Framers and SERDES. It generates less than 1 psRMS
jitter over the OC-192 bandwidth.
SCG6500NT is well suited for use in line cards, service
termination cards and similar functions to provide reliable reference,
phase locked, synchronization for TDM, PDH, SONET, and SDH
network equipment. The SCG6500NT provides a jitter filtered,
wander following output signal synchronized to a superior Stratum
or peer input reference signal.
General Description
The SCG6500NT unit provides high precision phase
lock loop frequency translation for the telecommunication
applications. The SCG6500NT unit generates LVPECL
outputs from an intrinsically low jitter, voltage controlled
crystal oscillator. The SCG6500NT unit can be configured
to provide a jitter attenuated, internal reference.
SCG6500NT is well suited for use in line cards, service
termination cards and similar functions to provide reliable
reference, phase locked, synchronization for TDM, PDH,
SONET and SDH network equipment . The SCG6500NT
provides a jitter filtered, wander following output signal
synchronized to a superior Stratum or peer input reference
signal.
The SCG6500NT include the following features: Free
Run, and alarm outputs for Loss-of-Reference, (LORA,
LORB), Loss-of-Lock, (LOL). The LVPECL outputs may be
put into a disable condition for external testing purposes.
The SCG6500NT is a 3.3 Volt component. The unit can
be used in applications that require temperature rating of 0°
- 70° C. The SCG6500NT package dimensions are 1.3” x
1.963” x 0.45” on a eight layer FR4 board with a high speed
differential connector.
General Mode Description
The SCG6500NT may be operated in any one of three
modes, Manual, Autonomous Non-Revertive, or
Autonomous Revertive Mode.
In Manual Mode, the modules operating state is
determined solely and exclusively by the Control Inputs.
The SCG6500NT will unconditionally follow the Control
Inputs. Proper synchronization and module operation are
user responsibilities.
In Autonomous Non-Revertive or Revertive Mode,
the modules operating condition is determined by the
Control Inputs and the validity of the selected operational
condition. The SCG6500NT will follow Control Inputs as
long as the selected operating condition is valid.
In autonomous mode the module alarms are monitored
to determine the validity of the current operational condition
state. If the selected reference becomes invalid the module
will attempt to lock to the redundant reference. If no valid
references are available the module will set the internal
VCXO to Hold Last if the HLV output is active. HLV is a
signal indicating that there is a Hold Last value present.
The module will set the internal VCXO to Free Run if
references A & B are invalid and the HLV output is not
active.
For example, the Control Inputs are set to lock to
REFA and no alarms are active. The user then sets the
Control Inputs to lock to REFB but the LORB alarm is
active. The module will remain in lock to REFA.
Autonomous mode establishes absolute preference for
valid operating conditions; REFA is valid; REFB, though
selected, is invalid; the module remains in lock to the
valid reference, REFA.
*Note the module doesn’t assume responsibility for
reference qualification.
Reference qualification is a user responsibility. The
module only verifies that a signal is present but cannot
check for Stratum quality. A signal must be present for
10 seconds before the module considers it a valid
reference.
In Autonomous Revertive Mode, the Control Inputs
set a preferred reference. The module will revert to the
preferred reference as long as it is considered valid.
In Autonomous Non-Revertive Mode, there is no
preferred reference. The module will remain on a
reference as long as it is considered valid.
Mode Inputs
Module Reset
Table 1
Mode1
Table 2
Mode 0
Mode
Reset
Description
0
X
Manual
0
Normal Operation
1
0
Autonomous Non-Revertive
1
Module Reset to power on condition
1
1
Autonomous Revertive
Advance Data Sheet #: SG034
Page 2 of 12
Rev: A05
Date: 6 / 24 / 02
© Copyright 2002 The Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice
Control Descriptions
Free Run is an operational state that sets the module output
to a nominal frequency.
Lock to Reference A or B is an operational state that phase
locks the module output to the respective reference.
Hold Last is an operational state that sets the module output
to a previous loop frequency. The value stored in the Hold
Last latch is updated once every second.
Control Inputs
Table 3
CTL1
CTL0
Operational Condition
0
0
Free Run
0
1
Lock to Reference A
1
0
Lock to Reference B
1
1
Hold Last
Status Output Descriptions
Control Status Outputs, used to report the current control of
the module in both Manual and Autonomous Modes. In
Manual Mode the Control Status Outputs reflect the Control
Inputs. In Autonomous Mode the Control Status Outputs may
be different than the Control Inputs depending on
circumstances. When the internal state machine
acknowledges the need for a change in control it updates the
Control Status Outputs on the next internal clock cycle of
12.86 ns.
Hold Last Valid, used to report that a lock value has been
entered into the Hold Last register. In Autonomous Mode the
Hold Last Valid output is used to restrict the entry into Hold
Last.
LORA and LORB, used to report that no signal is present on
respective reference. LOR alarms are missing pulse detectors
and don’t indicate frequency out of range. In Autonomous
Mode an LOR alarm is blanked to the internal state machine
for ten seconds after alarm transitions to non-alarm state.
External LOR alarms outputs are not blanked.
LOL, used to report that the reference is greater than 94° out
of phase with the VCXO. LOL alarm is only valid in a lock
state (i.e. Lock to Reference A). In Autonomous Mode the LOL
is used to start a ten second qualification timer on the
respective reference. Once the timer expirers the respective
reference is considered valid by the internal state machine.
Control Status Outputs
Table 4
CS1
CS0
Current Operational Status
0
0
Free Run
0
1
Lock to Reference A
1
0
Lock to Reference B
1
1
Hold Last
Hold Last Valid Output
Table 5
HLV
Description
0
Hold Last Invalid
1
Hold Last Valid
LORA or LORB Outputs
Table 6
LORA or LORB
Description
0
No Alarm
1
Loss of Reference
LOL Output
Table 7
LOL
Description
0
No Alarm
1
Loss of Lock
Output Enable Settings
ENQ1, ENQ2, ENQ3, ENQ4, and ENQ5 are used to enable
and disable the respective output. Logic low on the ENQ pin
will enable the output. Logic high on the ENQ pin will state
lock the output.
Enable Control Inputs
Table 8
ENQ#
Advance Data Sheet #: SG034
© Copyright 2002 The Connor-Winfield Corp.
Output State
0
Enabled
1
State Locked
Page 3 of 12
Rev: A05
Date: 6 / 24 / 02
All Rights Reserved Specifications subject to change without notice
Absolute Maximum Rating
Table 9
Symbol
Parameter
Minimum
Nominal
Maximum
Units
Notes
Vcc
Power Supply Voltage
-0.5
-
4.0
Volts
1.0
Vi
Input Voltage
-0.5
-
4.0
Volts
1.0
Ts
Storage Temperature
-40
-
100
°C
1.0
Specifications
Table 10
Symbol
Parameter
Minimum
Nominal
Maximum
Units
Notes
VCC
Power supply voltage
3.125
3.3
3.465
V
2.0
ICC
Power supply current
-
400
TBD
mA
TO
Temperature Range
0
-
70
°C
fFR
Free Run Accuracy
-20
-
20
ppm
fRefA
Input Reference A
-
8
-
kHz
fRefB
Input Reference B
-
8
-
kHz
fCAP
Capture/Pull-in Range
-25
-
25
ppm
fBW
Jitter Filter Bandwidth
1
3.6
10
Hz
3.0
tAQ
Acquisition Time
-
200
-
ms
4.0
tRF
Output Rise and Fall Time (20%-80%)
@622.08 MHz
@155.52 MHz
@77.76 MHz
-
250
300
-
1
ps
ps
ns
5.0
5.0
5.0
DC
Output Duty Cycle
45
50
55
%
JGEN
Jitter Generation
@622.08 MHz
@155.52 MHz
@77.76 MHz
-
-
0.8
1
4
psRMS
psRMS
psRMS
JPK
Jitter Transfer Peaking
-
0.1
0.2
dB
MTIESR
[email protected] Rearrangement
-
6
-
ns
NOTES:
1.0: Operation of the device at these or any other
condition beyond those listed under Operating
Specifications is not implied. Exposure to Absolute
Maximum Rating conditions for extended periods of
time may affect device reliability.
2.0: Requires external Regulation and supply decoupling
(2.2 uF, 330 pF)
6.0
7.0
8.0
3.0: 3dB loop response
4.0: From a 20 ppm step in reference frequency
5.0: See Recommended Line Termination for load requirements
6.0: Jitter based on SONET OC-192 bandwidth (12 kHz to 80 MHz)
7.0: Jitter based on SONET OC-48 bandwidth (12 kHz to 20 MHz)
8.0: Jitter based on SONET OC-12 bandwidth (12 kHz to 5 MHz)
Advance Data Sheet #: SG034
Page 4 of 12
Rev: A05
Date: 6 / 24 / 02
© Copyright 2002 The Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice
Input And Output Characteristics
Table 11
Symbol
Parameter
Minimum
Nominal
Maximum
Units
2
-
3.6
V
Notes
LVTTL Input and Output Characteristics
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
0
-
0.8
V
TIO
I/O to Output Valid
-
-
10
nS
CO
Output Capacitance
-
-
10
pF
VOH
High Level Output Voltage, lOH = 04mA
2.4
-
-
V
Vcc Min.
VOL
Low Level Output Voltage, lOL = 8mA
-
-
0.4
V
Vcc Max.
TIR
Input Reference Signal Pulse Width
25.72
-
-
nS
2.27
-
2.52
V
LVPECL Output Characteristics for Q1 & Q2
VOH
High Level Output Voltage
VOL
Low Level Output Voltage
1.49
-
1.68
V
Cl
Output Capacitance
-
-
10
pF
Tskew
Differential output skew
-
-
50
ps
LVPECL Output Characteristics for Q3, Q4 & Q5
VOH
High Level Output Voltage
-
2.48
-
V
VOL
Low Level Output Voltage
-
0.96
-
V
Cl
Output Capacitance
-
-
10
pF
Tskew
Differential output skew
-
-
50
ps
Advance Data Sheet #: SG034
© Copyright 2002 The Connor-Winfield Corp.
Page 5 of 12
Rev: A05
Date: 6 / 24 / 02
All Rights Reserved Specifications subject to change without notice
Pin Description
Table 12
Pin #
Pin Name
Description
Input Default State
3,8,13,18,
VCC
23,28,33,38,
43,48,53,58,
63,68,73,78,
83,88,93,98
Supply voltage relative to ground
N/A
1,2,5,7,9,
GND
10,12,16,17,
22,27,31,32,
37,42,46,47,
51,52,57,62,
66,67,72,77,
81,82,87,92,
94,95,96,97,100
Ground
N/A
55
MODE0
Mode Input
Logic 0
75
MODE1
Mode Input
Logic 0
70
CTL0
Control Input
Logic 0
74
CTL1
Control Input
Logic 0
30
RESET
Reset module to power on conditions
Logic 0
15
ENQ1
Active low enable Q1
Logic 0
19
ENQ2
Active low enable Q2
Logic 0
79
ENQ3
Active low enable Q3
Logic 0
60
ENQ4
Active low enable Q4
Logic 0
34
ENQ5
Active low enable Q5
Logic 0
99
REFA
Input reference
N/A
4
REFB
Input reference
N/A
69
CS0
Control Operational Status
N/A
64
CS1
Control Operational Status
N/A
54
HLV
Hold Last Valid
N/A
65
LOL
Loss-of-Lock “Active Reference”
N/A
45
LORA
Loss-of-Reference A
N/A
39
LORB
Loss-of-Reference B
N/A
11
Q1P
Positive LVPECL Differential Output
N/A
6
Q1N
Negative LVPECL Differential Output
N/A
21
Q2P
Positive LVPECL Differential Output
N/A
26
Q2N
Negative LVPECL Differential Output
N/A
36
Q3P
Positive LVPECL Differential Output
N/A
41
Q3N
Negative LVPECL Differential Output
N/A
71
Q4P
Positive LVPECL Differential Output
N/A
76
Q4N
Negative LVPECL Differential Output
N/A
56
Q5P
Positive LVPECL Differential Output
N/A
61
Q5N
Negative LVPECL Differential Output
N/A
84,85,
89,90
JTAG
No connection. Do not connect.
Do not connect. No BSDL files available
14,20,24,25
NC
29,35,40,44,
49,50,59,80,86,91
No connection. Do not connect
Advance Data Sheet #: SG034
Page 6 of 12
Rev: A05
Date: 6 / 24 / 02
© Copyright 2002 The Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice
Functional Block Diagram
Figure 1
MODE0
Input
Connection
MODE1
CTL0
Output
Connection
CS0
CS1
State
Machine
CTL1
HLV
ENQ1
REF
SEL
REF A
SYNC
PD
SYNC
LPF
VCXO
622.08
MHz
DAC
REF B
Q1P
Q1N
LORA
Divider
Control
LORB
LOL
ENQ2
155.52
MHz
Q2P
77.76
MHz
ENQ3
Q2N
Q3P
77.76
MHz
ENQ4
Q3N
Q4P
8 kHz
ENQ5
Q4N
Q5P
Q5N
Loss of Reference Timing Diagram
Figure 2
LOR (loss-of-reference)
EXT 8 kHz REF
INT 8 kHz REF
125 µ s
125µs - 250µs
LOR
Advance Data Sheet #: SG034
© Copyright 2002 The Connor-Winfield Corp.
Page 7 of 12
Rev: A05
Date: 6 / 24 / 02
All Rights Reserved Specifications subject to change without notice
Manual Mode State Machine
Figure 3
User Selected Free Run Mode
Free Run
User Selected Free Run Mode
User Selected Lock Mode
User Selected Hold Last Mode
User Selected Free Run Mode
User Selected Lock Mode
Lock
Hold Last
User Selected Hold Last Mode
User Selected Lock Mode
User Selected Hold Last Mode
Note: Lock Mode is one in which the unit is locked to the selected reference, which is either Ref A or Ref B
Autonomous Mode State Machine
Figure 4
User Selected Free Run Mode
or
No Valid References Available
or
No Valid Hold Last Available
Free Run
User Selected Free Run Mode
or
No Valid Hold Last Available
User Selected Free Run Mode
or
(No Valid Hold Last Available
and
No Valid References Available)
User Selected Lock Mode
and
Valid References Available
Lock
User Selected Lock Mode
and
Valid References
Available
User Selected Hold Last Mode
and
Valid Hold Last Available
User Selected Lock Mode
and
Valid Reference Available
(User Selected Hold Last Mode
or
No Valid Reference Available)
and
Valid Hold Last Available
Hold Last
(User Selected Hold Last Mode
or
No Valid References Available)
and
Valid Hold Last Available
Notes:
1) Lock Mode is one in which the unit is locked to either Ref A or Ref B, but not always the selected reference
2) See General Mode Description for Revertive and Non-Revertive operation
Advance Data Sheet #: SG034
Page 8 of 12
Rev: A05
Date: 6 / 24 / 02
© Copyright 2002 The Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice
Recommended Connector Placement and Component Keep Out Area
Figure 5
1.300
1.175
1.125
96
100
Ø0.180
Copper Pad
Ball Grid = 5 x 20 @ 0.050 pitch,
0.650
Footprint for Samtec connector
Samtec PN: YFS-20-03-E-05-SB-K-TR
Consult Samtec for detailed specifications
www.samtec.com
0.225
0.175
0.125
1
5
0.000
1.963
1.838
0.550
0.350
0.400
0.125
0.000
Ø0.104
Finished Hole
Maximum Dimensions
Figure 6
1.963 [49.85]
0.276 [7.01]
1.300 [33.02]
1.050 [26.67]
0.525 [13.34]
0.050 [1.27]
Max. Height
0.450 [11.43]
1.713 [43.50]
Advance Data Sheet #: SG034
© Copyright 2002 The Connor-Winfield Corp.
Page 9 of 12
Rev: A05
Date: 6 / 24 / 02
All Rights Reserved Specifications subject to change without notice
Recommended Line Termination
Figure 7
Q+
D+
50 OHM Transmission Line
LVPECL
LVPECL
100 Ω
OUTPUT
INPUT
Q-
GND
GND
Vcc
3.3 VDC
Vcc
3.3 VDC
D-
50 OHM Transmission Line
Recommended LVPECL to LVDS Conversion for Q1 & Q2
Figure 8
3.3 VDC
3.3 VDC
56 Ω
Q+
D+
50 OHM Transmission Line
LVPECL
Vcc
Vcc
82 Ω
LVDS
OUTPUT
INPUT
Q-
D-
50 OHM Transmission Line
GND
GND
56 Ω
82 Ω
Advance Data Sheet #: SG034
Page 10 of 12
Rev: A05
Date: 6 / 24 / 02
© Copyright 2002 The Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice
Revision
Revision DateNote
A00
7/20/01
Advance Informational Release
A01
7/24/01
Added Samtec Connector PN
A02
7/30/01
Changed Pin outs
A03
12/03/01
Updated Pin Descriptions
A04
12/10/01
Made correction to diagrams
A05
6/24/02
Added Table 2, Module Reset
Advance Data Sheet #: SG034
© Copyright 2002 The Connor-Winfield Corp.
Page 11 of 12
Rev: A05
Date: 6 / 24 / 02
All Rights Reserved Specifications subject to change without notice
2111 Comprehensive Drive
Aurora, Illinois 60505
Phone: 630- 851- 4722
Fax: 630- 851- 5040
www.conwin.com
Advance Data Sheet